48252123bc
1998-09-03 Philip Blundell <pb@nexus.co.uk> * sysdeps/arm/bits/endian.h (__FLOAT_WORD_ORDER): Define to big endian. * math/math_private.h: Use __FLOAT_WORD_ORDER rather than BYTE_ORDER. * string/endian.h: If __FLOAT_WORD_ORDER wasn't defined by <bits/endian.h>, make it the same as __BYTE_ORDER. 1998-11-27 Ulrich Drepper <drepper@cygnus.com> * math/math.h: Avoid using long double functions in generic macros if __NO_LONG_DOUBLE_MATH. * sysdeps/arm/dl-machine.h: Fix handling of weak undefined symbols during bootstrapping. * scripts/config.sub: Add Netwinder specific matches. Patch by Scott Bambrough <scottb@corelcomputer.com>. 1998-11-26 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * Makeconfig ($(common-objpfx)sysd-dirs): Use automatic variables if possible. ($(common-objpfx)sysd-sorted): Likewise. 1998-11-27 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sysdeps/libm-ieee754/e_log.c (__ieee754_log): Add declaration of local variables t1,t2 only if needed. * sysdeps/libm-ieee754/e_atan2.c: Added braces to avoid compiler warnings. * sysdeps/libm-ieee754/s_truncf.c (__truncf): Likewise. * sysdeps/libm-ieee754/s_trunc.c (__trunc): Likewise. * sysdeps/mips/mul_1.S (Loop): Add closing comment to avoid warning. 1998-11-27 Andreas Jaeger <aj@arthur.rhein-neckar.de> * math/math.h: Add brace to correct #if expression.
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* Truncate argument to nearest integral value not larger than the argument.
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Copyright (C) 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <math.h>
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#include "math_private.h"
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double
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__trunc (double x)
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{
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int32_t i0, j0;
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u_int32_t i1;
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int sx;
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EXTRACT_WORDS (i0, i1, x);
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sx = i0 & 0x80000000;
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j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
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if (j0 < 20)
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{
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if (j0 < 0)
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/* The magnitude of the number is < 1 so the result is +-0. */
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INSERT_WORDS (x, sx, 0);
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else
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INSERT_WORDS (x, sx | (i0 & ~(0x000fffff >> j0)), 0);
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}
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else if (j0 > 51)
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{
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if (j0 == 0x400)
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/* x is inf or NaN. */
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return x + x;
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}
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else
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{
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INSERT_WORDS (x, i0, i1 & ~(0xffffffffu >> (j0 - 20)));
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}
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return x;
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}
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weak_alias (__trunc, trunc)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__trunc, __truncl)
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weak_alias (__trunc, truncl)
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#endif
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